A Deep Convolutional Neural Network for the Detection of Polyps in Colonoscopy Images
This work addresses a critical medical imaging task for improving colonoscopy accuracy, but it appears incremental as it builds on existing deep learning methods with specific architectural tweaks.
The paper tackles the problem of detecting colonic polyps in colonoscopy images, which is challenging due to variations in appearance and imitators, by proposing a deep convolutional neural network model that achieves better performance in precision, sensitivity, F1-score, F2-score, and dice-coefficient compared to benchmarks.
Computerized detection of colonic polyps remains an unsolved issue because of the wide variation in the appearance, texture, color, size, and presence of the multiple polyp-like imitators during colonoscopy. In this paper, we propose a deep convolutional neural network based model for the computerized detection of polyps within colonoscopy images. The proposed model comprises 16 convolutional layers with 2 fully connected layers, and a Softmax layer, where we implement a unique approach using different convolutional kernels within the same hidden layer for deeper feature extraction. We applied two different activation functions, MISH and rectified linear unit activation functions for deeper propagation of information and self regularized smooth non-monotonicity. Furthermore, we used a generalized intersection of union, thus overcoming issues such as scale invariance, rotation, and shape. Data augmentation techniques such as photometric and geometric distortions are adapted to overcome the obstacles faced in polyp detection. Detailed benchmarked results are provided, showing better performance in terms of precision, sensitivity, F1- score, F2- score, and dice-coefficient, thus proving the efficacy of the proposed model.